OzPeter writes: A wheat farmer in Australia has eliminated adding fertilizer to his crop by the simple process of injecting the cooled diesel exhaust of his modified tractor into ground when the wheat is being sown. In doing so he eliminates releasing carbon into the atmosphere and at the same time saving himself up to $AUD500,000 that would have been required to fertilize his 3900 hectares in the traditional way. Yet the crop yields over the last 2 years are on at least par with his best yields since 2001. The technique was developed by a Canadian, Gary Lewis of Bio Agtive and is currently in trial at 100 farms around the world.